Full list of all 93 Assassin's Creed Odyssey achievements. It takes around 80-100 hours to unlock all of the achievements in the base game on Windows.
The base game contains 50 achievements, and there are 5 DLC packs containing 43 achievements.
Complete all underwater location objectives.
Complete the Hippokrates questline.
Complete Xenia's questline.
Unveil all sub-regions of Greece.
Upgrade the Adrestia to Legendary Status.
Perform an Overpower Attack with every weapon type.
Recover the Cyclops's eye from a goat on Kephallonia.
Complete 20 Quests on Pephka, Obsidian and Abantis islands.
Defeat the Cyclops.
Defeat all the Cultists of Kosmos.
Defeat Medusa.
Complete Episode 9 + Epilogue.
Upgrade your Spear to Tier 6.
Complete Episode 8.
Complete Episode 7.
Complete the Olympic questline.
Defeat the Minotaur.
Outwit the Sphinx.
Discover Atlantis and speak with Pythagoras.
Win your first on land conquest battle in any region (excluding Megaris in Hero's Journey).
Defeat a Mercenary in the Arena.
Become Champion of the Arena.
Reach Level 50.
Acquire a Tier 3 active Ability.
Complete Episode 6.
Become the first Mercenary.
Complete the Daughters of Artemis questline.
Complete Episode 5.
Engrave a Legendary Item with a Legendary Effect.
Defeat a full cluster of Cultists of Kosmos.
Fully crew the Adrestia with Legendary Lieutenants.
Complete Markos's questline.
Kill the Leader of any Region with Low Resources, other than Megaris.
Raise your Bounty to the maximum level.
Complete 20 Bounties, War Contracts, or Naval Quests from Message Boards.
Sink your first Epic Ship.
Complete Episode 4.
Cleave a ship in half.
Cleave a ship while having an all-women crew.
Upgrade the Adrestia for the first time.
Engrave your first item.
Complete Episode 3.
Complete Episode 2.
Spend the night with another character.
Recruit and assign a Legendary NPC for your ship.
Complete Episode 1.
Equip 1 Legendary melee weapon and 5 Legendary armor pieces.
Equip a Legendary Armor set.
Acquire and equip your first Legendary item.
Complete the Battle of 300.
Heal by getting 10 headshot kills while you have the Golden Harbinger equipped.
Set 10 enemy ships on fire.
Heal by parrying 10 times with the Judgment of the Lion.
Kill the Makedonian Lion
Land a Rush Assassinate that chains 4 times with the Blade of the Lion
Acquire the Sword of Kings
Kill all of the Ancients in the Order of the Storm in Achaia.
Kill all the Ancients in the Order of Dominion in Messenia
Secure your bloodline
Continue the bloodline.
Kill all the Ancients in the Order of the Hunters in Makedonia
Kill 10 enemies using the Rapid Fire ability.
Kill 10 enemies using the Fury of the Bloodline Ability.
Discover the truth about Darius' past
Kill 10 enemies using the Death Veil ability
Complete Every Story Has an Ending
Complete A Poet's Legacy.
Complete A Brother's Seduction
Complete Old Flames Burn Brighter
Complete One Really, Really Bad Day
Complete The Heir of Memories
Complete The Daughters of Lalaia
Complete The Image of Faith
Complete Divine Intervention.
Complete The Show Must Go On.
Complete A Friend Worth Dying For
Defeat the Hekatonchires.
Completely fill the Knowledge Sequence.
Forge the 3 Legendary Weapons.
Kill 10 Isu Soldiers with the Blessing of Kronos enhancement.
Collect all the Keeper's Insights in Episode 3.
Defeat all of the Fallen.
Close all Tartaros Rifts.
Destroy all of the Marble Maiden Tributes.
Collect all the Keeper's Insights in Episode 2.
Dethrone the king.
Defeat Cerberos.
Win the conquest of Elysium with freed humans from the 3 main regions.
Collect all the Keeper's Insights in Episode 1.
Kill all Overseers in Elysium.
Remember who you are.
Defeat Arges, the Bright One
Defeat Steropes the Lightning Bringer.